Steel tube truss support system for silo top and construction method of steel tube truss support system

The invention belongs to the technical field of architectural structure engineering, and relates to a steel tube truss support system for the silo top. The system comprises a first circle of steel wire ropes (1a), a second circle of steel wire ropes (1b), a third circle of steel wire ropes (1c), a steel tube truss (2), lower braces (3) and a circle of climbing rods (8) reserved at the upper part of a silo (10), wherein the steel tube truss (2) adopts a space rod system built by scaffold steel tubes and fasteners for construction and adopts a space truss structure formed by orthogonal arranging of a series of plane trusses, and the size of the steel tube truss is determined according to the inner diameter of the wall of the silo (10); three steel wire ropes are obliquely pulled to the silo from at upper part of the steel tube truss (2); and the lower part of the steel tube truss (2) is supported on the silo by a circle of lower braces (3). The invention further relates to a silo top construction method adopting the support system. According to the steel tube truss support system for silo top and the construction method, the construction period can be shortened, the construction cost can be reduced, and the structural carrying capacity and normal use requirements can be met.